| # | Company | Employees |
|---|---|---|
| 1 |
OTE Group of Companies (HTO)cosmote.gr
A leading technology company in Greece, part of Deutsche Telekom Group, providing a wide range of telecom services and ICT solutions for digital transformation and growth |
7,648 |
| 2 |
Eurobankeurobank.gr
A strong financial organization offering a wide range of products and services in banking and financial sectors, focusing on social responsibility and sustainability |
6,916 |
| 3 |
Piraeuspiraeusholdings.gr
Leading Greek bank offering diverse financial products, extensive distribution, supporting economic recovery, agriculture, investment banking, leasing, shipping finance, and energy transition financing. |
6,122 |
| 4 |
National Bank of Greecenbg.gr
A bank with a rich history and a promising future, offering stability, expertise, digital services, and a strong presence in Greece and abroad |
5,473 |
| 5 |
Alpha Bankalpha.gr
Enabling progress in life and business through integrated finance, supporting businesses in the green and digital economy, fostering inclusive progress for people and communities. |
5,173 |
| 6 |
PPC S.A.ppcgroup.com
Leading Greek electric utility in power generation, distribution, and supply, focusing on decarbonization, digitalization, renewables, and customer-centric growth, with significant market presence and assets |
2,980 |
| 7 | 2,894 | |
| 8 |
Aktor Groupintrakat.gr
A leading international infrastructure provider offering construction, photovoltaic parks, quarry management, technical facilities, and project management services with extensive experience and expertise |
1,546 |
| 9 |
GEK TERNA Group of Companiesgekterna.com
A leading business group in Greece with a global presence, specializing in infrastructure, energy production, waste management, and real estate development |
1,476 |
| 10 |
Ethniki Asfalistikiethnikiasfalistiki.gr
With over a century of experience, we provide innovative insurance products and services to safeguard what matters most to individuals |
1,380 |
| 11 |
Bank of Greecebankofgreece.gr
Independent central bank ensuring price stability, overseeing financial system stability, participating in euro area monetary policy, and supporting commercial banks. |
1,210 |
| 12 |
THENAMARISthenamaris.com
Global ship manager operating diverse high-specification ocean-going vessels with a focus on safe, efficient, and profitable management services worldwide |
1,186 |
| 13 |
ΔΕΔΔΗΕ Α.Ε. - HEDNO S.A.deddie.gr
An independent organization managing electricity distribution for millions of customers through medium and low voltage networks, also overseeing high voltage networks |
989 |
| 14 |
ΥΓΕΙΑ / Hygeia Hospitalhygeia.gr
A leading private hospital in Greece, established in 1974, providing high-quality health services and developing an integrated network of healthcare both locally and internationally |
918 |
| 15 |
MARAN GAS MARITIME INC.marangas.com
Specializing in gas shipping, the organization manages LNG and LPG carriers within a diverse fleet, with over 300 professionals supporting a large crew |
848 |
| 16 |
Group IASOiaso.gr
Leading healthcare provider in Greece with 3 clinics focused on obstetrics, gynaecology, general care, children's health, and cooperation with top global hospitals for service enhancement |
845 |
| 17 |
IPTO-Independent Power Transmission Operatoradmie.gr
This organization in Greece operates as the Transmission System Operator ensuring reliable electricity supply, market operation, and infrastructure development |
734 |
| 18 |
PPC Renewables - ΔΕΗ Ανανεώσιμεςppcr.gr
Specializing in renewable energy production, this subsidiary of Greece's largest power generation company focuses on wind, solar, hydro, geothermal, and biomass energy |
682 |
| 19 | 591 | |
| 20 |
Cepal Hellas Financial Services S.A.cepal.gr
A pioneer in loan and credit receivables management in Greece, utilizing advanced analytics and ethical practices to revolutionize the banking sector |
559 |
| 21 |
Pantheon Tankers Management LTDpantheontankers.com
Leading independent tanker ship manager providing world-class services with a focus on safety, environmental protection, and meeting customer requirements Committed to zero accidents and harm |
372 |
| 22 |
Attica Bankcrediabank.com
Dynamic financial services provider in Greece with 37 branches, offering banking and investment products for individuals, SMEs, and large companies |
336 |
| 23 |
Terna Energyterna-energy.com
Develops and operates renewable energy projects, holding the largest and most diversified portfolio in Greece, with significant installed capacity and ambitious growth plans. |
289 |
| 24 |
Generali Hellasgenerali.gr
Insurance provider with a long history in Greece, offering personalized solutions through a strong sales network to help customers shape a secure future |
278 |
| 25 |
Eurobank Ergasias SAeurobank.gr
A leading Greek bank offering a wide range of financial products and services to individuals and businesses, with operations across several European countries |
73 |
| 26 |
PROTON BANKproton.gr
Specialized investment bank founded in 2001, offering innovative technology-driven financial products and services in line with international market practices |
57 |
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.